Mobile Communication Terminal

1. A mobile communication terminal that simultaneously transmits data through a plurality of channels, comprising: circuitry configured to perform transmission power control such that a sum of transmission powers is a target value; calculate a sum of average transmission powers of the respective channels in a monitoring period; and perform reduction control of the transmission powers, wherein a control period is set so as to include the monitoring period and a transmission power suppression period following the monitoring period, and the circuitry reduces, when the sum of the average transmission powers of the respective channels in the monitoring period is equal to or more than a threshold value of the sum of the average transmission powers of the respective channels, the transmission powers of the respective channels in the transmission power suppression period such that the average value of the sum of the transmission powers of the respective channels in the control period is equal to or less than the threshold value.

2. The mobile communication terminal according to claim 1 , wherein the circuitry is configured to decide target values of the transmission powers of the respective channels in the transmission power suppression period, on a basis of an average value of ratios of the transmission powers of the respective channels at a plurality of time points in the monitoring period, and reduce the transmission powers in the transmission power suppression period such that the average value of the sum of the transmission powers of the respective channels in the control period is equal to or less than the threshold value.

3. The mobile communication terminal according to claim 1 , wherein the circuitry is configured to decide target values of the transmission powers of the respective channels in the transmission power suppression period, on a basis of ratios of the average transmission powers of the respective channels calculated by the circuitry, and reduce the transmission powers in the transmission power suppression period such that the average value of the sum of the transmission powers of the respective channels in the control period is equal to or less than the threshold value.

4. The mobile communication terminal according to claim 1 , wherein the circuitry is configured to decide target values of the transmission powers of the respective channels in the transmission power suppression period, on a basis of ratios of the transmission powers of the respective channels at an end of the monitoring period, and reduce the transmission powers in the transmission power suppression period such that the average value of the sum of the transmission powers of the respective channels in the control period is equal to or less than the threshold value.

5. The mobile communication terminal according to claim 1 , wherein the circuitry is configured to decide target values of the transmission powers of the respective channels in the transmission power suppression period, on a basis of the transmission powers of the respective channels at an end of the monitoring period and temporal change rates thereof, and reduce the transmission powers in the transmission power suppression period such that the average value of the sum of the transmission powers of the respective channels in the control period is equal to or less than the threshold value.

6. The mobile communication terminal according to claim 1 , wherein the circuitry is configured to set 0 to the transmission power(s) of one or more channels in the transmission power suppression period, and decide target values of the transmission powers of the respective channels other than the one or more channels, and reduce the transmission powers in the transmission power suppression period such that the average value of the sum of the transmission powers of the respective channels in the control period is equal to or less than the threshold value.

7. The mobile communication terminal according to claim 1 , wherein the circuitry is configured to transmit and receive data in the transmission power suppression period by switching to only selected channels, and reduce the transmission powers in the transmission power suppression period such that the average value of the sum of the transmission powers of the respective channels in the control period is equal to or less than the threshold value.

8. The mobile communication terminal according to one of claims 1 to 7 , wherein the circuitry is configured to calculate an average transmission power during each of a plurality of monitoring periods that are temporally shifted in an overlapping manner, and perform reduction control in the control period corresponding to the monitoring period having a largest value among the plurality of average transmission powers calculated by the circuitry.

9. A mobile communication terminal that simultaneously transmits data through a plurality of channels, comprising: circuitry configured to perform transmission power control such that a sum of transmission powers is a target value; calculate a sum of ratios of average transmission powers of the respective channels in a monitoring period to threshold values of the corresponding channels; and perform reduction control of the transmission powers, wherein a control period is set so as to include the monitoring period and a transmission power suppression period following the monitoring period, and the circuitry reduces, when the sum of the ratios of the average transmission powers of the respective channels in the monitoring period is equal to or more than a threshold value of the sum of the ratios of the average transmission powers of the respective channels, the transmission powers of the respective channels in the transmission power suppression period such that the sum of the ratios of the average transmission powers of the respective channels in the control period is equal to or less than the threshold value of the sum of the ratios.

10. The mobile communication terminal according to claim 9 , wherein the circuitry is configured to decide target values of the transmission powers of the respective channels in the transmission power suppression period, on a basis of an average value of ratios of ratios of the respective channels which are ratios of the transmission powers of the corresponding channels at a plurality of time points in the monitoring period to the threshold values of the corresponding channels, and reduce the transmission powers in the transmission power suppression period such that the sum of the ratios of the average transmission powers of the respective channels in the control period is equal to or less than the threshold value of the sum of the ratios.

11. The mobile communication terminal according to claim 9 , wherein the circuitry is configured to decide target values of the transmission powers of the respective channels in the transmission power suppression period, on a basis of ratios of ratios of the respective channels which are ratios of the average transmission powers of the corresponding channels calculated by the circuitry to the threshold values of the corresponding channels, and reduce the transmission powers in the transmission power suppression period such that the sum of the ratios of the average transmission powers of the respective channels in the control period is equal to or less than the threshold value of the sum of the ratios.

12. The mobile communication terminal according to claim 9 , wherein the circuitry is configured to decide target values of the transmission powers of the respective channels in the transmission power suppression period, on a basis of ratios of the respective channels which are ratios of the transmission powers of the corresponding channels at an end of the monitoring period to the threshold values of the corresponding channels, and reduce the transmission powers in the transmission power suppression period such that the sum of the ratios of the average transmission powers of the respective channels in the control period is equal to or less than the threshold value of the sum of the ratios.

13. The mobile communication terminal according to claim 9 , wherein the circuitry is configured to decide target values of the transmission powers of the respective channels in the transmission power suppression period, on a basis of ratios of the transmission powers of the respective channels at an end of the monitoring period to the threshold values of the corresponding channels; and temporal change rates thereof, and reduce the transmission powers in the transmission power suppression period such that the sum of the ratios of the average transmission powers of the respective channels in the control period is equal to or less than the threshold value of the sum of the ratios.

14. The mobile communication terminal according to claim 9 , wherein the circuitry is configured to set 0 to the transmission power(s) of one or more channels in the transmission power suppression period, and decide target values of the transmission powers of the respective channels other than the one or more channels, and reduce the transmission powers in the transmission power suppression period such that the sum of the ratios of the average transmission powers of the respective channels in the control period is equal to or less than the threshold value of the sum of the ratios.

15. The mobile communication terminal according to claim 9 , wherein the circuitry is configured to transmit and receive data in the transmission power suppression period by switching to only selected channels, and reduce the transmission powers in the transmission power suppression period such that the sum of the ratios of the average transmission powers of the selected channels in the control period is equal to or less than the threshold value of the sum of the ratios.

16. The mobile communication terminal according to one of claims 9 to 15 , wherein the circuitry is configured to calculate an average transmission power during each of a plurality of monitoring periods that are temporally shifted in an overlapping manner, and perform reduction control in the control period corresponding to the monitoring period having a largest value among the plurality of average transmission powers calculated by the circuitry.